Related Experiment Videos
Extracellular matrix proteins as early markers in diabetic nephropathy
I Jäckle-Meyer1, B Szukics, K Neubauer
1Abteilung für Nephrologie, Medizinische Hochschule Hannover, Germany.
European Journal of Clinical Chemistry and Clinical Biochemistry : Journal of the Forum of European Clinical Chemistry Societies
|April 1, 1995
Summary
Urinary collagen IV levels can indicate diabetic kidney disease progression. Increased urinary collagen IV and decreased serum collagen IV correlate with worsening albuminuria in diabetic patients.
Area of Science:
- Nephrology
- Diabetology
- Biochemistry
Background:
- Diabetic kidney disease (DKD) is characterized by basement membrane thickening and mesangial expansion.
- These morphological changes precede clinical symptoms like albuminuria.
- Diagnosis currently requires invasive kidney biopsy.
Purpose of the Study:
- To investigate if urinary excretion of renal extracellular matrix (ECM) proteins reflects DKD morphological alterations.
- To assess the diagnostic potential of ECM proteins in non-invasively detecting kidney damage in diabetes.
Main Methods:
- Patients with Type I and Type II diabetes were classified by urinary albumin excretion (UAE): normal (<30 µg/min), microalbuminuria (30-300 µg/min), and overt albuminuria (>200 µg/min).
- Serum and urine levels of laminin, collagen IV, and fibronectin were measured using radioimmunoassay or ELISA.
- Urinary fibronectin fragment patterns were analyzed by immunoblotting.
Main Results:
- Serum collagen IV decreased significantly with increasing albuminuria.
- Urinary collagen IV was undetectable in controls and normoalbuminuric patients, but significantly increased in overt albuminuria.
- Laminin levels in serum and urine did not change significantly among diabetic patient groups.
Conclusions:
- Urinary collagen IV excretion is a potential non-invasive biomarker for detecting and monitoring renal extracellular matrix alterations in diabetic kidney disease.
- Changes in collagen IV levels correlate with the severity of albuminuria, suggesting its utility in assessing DKD progression.